Feature

  1. Health & Medicine

    Ketones to the Rescue

    Medical researchers are investigating a slew of possible applications for acids called ketones, which the body produces naturally when deprived of carbohydrates and protein.

    By Ben Harder

  2. Tiny Bubbles

    Microscopic vesicles shed by cells may help the AIDS virus, benefit cancer cells, and drive the immune response.

    By John Travis
  3. Tech

    Wings of Change

    Inspired by the Wright brothers, who steered their first flyer by twisting its pliant wings, engineers are developing versatile and flexible flying machines expected to undergo radical shape changes in flight.

    By Peter Weiss
  4. Health & Medicine

    Testing Times

    Relying in part on a new rapid HIV test, health officials are working to identify and treat more HIV infections earlier in the course of the disease.